<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>refs</title>
  </head>
  <body>
    <!-- 准备好一个容器 -->
    <div id="test"></div>

    <!-- 引入react核心库 -->
    <script src="../js/react.development.js"></script>

    <!-- 引入react-dom用于支持react操作DOM  -->
    <script src="../js/react-dom.development.js"></script>

    <!-- 引用bable,用于将jsx转为js -->
    <script src="../js/babel.min.js"></script>

    <script type="text/babel">
      // 创建组件
      class Demo extends React.Component {
        // 展示左侧输入栏中的数据
        showData = () => {
          const { input1 } = this.refs
          alert(input1.value)
        }
        // 展示右侧输入栏的数据
        showData2 = () => {
          const { input2 } = this.refs
          alert(input2.value)
        }

        render() {
          return (
            <div>
              <input ref="input1" type="text" placeholder="点击按钮提示数据" />
              <button onClick={this.showData}>点我提示左侧的数据</button>
              <input
                onBlur={this.showData2}
                ref="input2"
                type="text"
                placeholder="失去焦点提示数据"
              />
            </div>
          )
        }
      }

      // 渲染组件到页面
      ReactDOM.render(<Demo />, document.getElementById('test'))
    </script>
  </body>
</html>
